Description : . How do tape transports with differential velocity capstans maintain a constant tape tension in the area around the magnetic heads?
Last Answer : The supply capstan is slightly larger than the take-up capstan. This causes the take-up capstan to pull the tape slightly faster than the supply capstan feeds the tape.
Description : How do closed-loop capstan drive tape transports overcome the disadvantages of the open-loop drive design?
Last Answer : Closed loop capstan drive transports use more than one capstan to clamp the tape in the area around the magnetic head.
Description : There are two types of tape transport configurations, open loop capstan drive and closed-loop capstan drive. What are two major disadvantages of open-loop capstan drive tape transports?
Last Answer : a. Only operates in one direction. b. The tape tension and head-to-tape contact can vary.
Description : If the three-phase motor, shown in the illustrated schematic diagram, is running in the forward direction, which of the following actions must occur before the motor will reverse rotation? EL-0011 A. Normally-closed ... 'L1' and 'L3' must be interchanged via the 'R' contacts. D. All of the above.
Last Answer : Answer: C
Description : Refering to the illustrated schematic diagram, which of the following statements is true when the motor is running in the forward direction? EL-0011 A. Normally-open contacts '4-5' are closed. B. Current ... switch. C. Normally-closed contacts 'R' are open. D. The blowout coils must be closed.
Last Answer : Answer: B
Description : What are the three most common closed-loop capstan drive designs?
Last Answer : a. Differential velocity capstans. b. Dual motors dual capstans. c. Peripheral drive capstans.
Description : On tank vessels with an electrically-driven capstan, the motor should be meggered periodically to test _____________. A. insulation resistance B. eddy currents C. capacitance D. armature reactance
Last Answer : Answer: A
Description : What type of reeling system best controls a tape recorder's tape tension during starts and stops?
Last Answer : A tape buffering reeling system
Last Answer : To reverse the direction of rotation of a capacitor start motor while it is running we should disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding.
Description : Both LEDs and ILDs operate correctly with ∙ A. forward bias ∙ B. reverse bias ∙ C. neither forward nor reverse bias ∙ D. either forward or reverse bias
Last Answer : A. forward bias
Description : Photodiodes operate properly with ∙ A. forward bias ∙ B. reverse bias ∙ C. neither forward nor reverse bias ∙ D. either forward or reverse bias
Last Answer : ∙ B. reverse bias
Description : Photodiodes operate property with ∙ a. Forward bias ∙ b. Reverse bias ∙ c. Neither A or B ∙ d. Either A or B
Last Answer : ∙ b. Reverse bias
Description : Both LEDs and ILDs operate correctly with ∙ a. Forward bias ∙ b. Reverse bias ∙ c. Neither A or B ∙ d. Either A or B
Last Answer : a. Forward bias
Description : Draw the power and control circuit diagram for forward — stop — Reverse type DOL starter for 3 phase induction motor.
Last Answer : Draw the power and control circuit diagram for forward — stop — Reverse type DOL starter for 3 phase induction motor.
Description : Due to the operating characteristics of the system, time lag fuses (or dual-element fuses) are necessary for use in _____________. A. main lighting circuits B. motor starting circuit C. emergency lighting circuits D. general alarm circuits
Description : What two receiver leads are reversed to reverse the rotor's direction of rotation?
Last Answer : 1 and S3.
Description : In the illustrated electronic governor, the circuit card connected to the potential and current transformers is for ________. EL-0046 A. increasing the signal strength to the governor to ... from motorization D. conditioning the load through the use of a magnetic amplifier current transformer
Description : Pick out the correct statement. (A) A catalyst speeds up the forward reaction but slows shown the reverse reaction (B) Addition of catalyst changes the equilibrium constant (C) Pressure changes do not change the equilibrium concentrations (D) The composition of equilibrium is changed by catalyst
Last Answer : (C) Pressure changes do not change the equilibrium concentrations
Description : Identify the INCORRECT statement below regarding chemical equilibrium. A All chemical reactions are, in principle, reversible. B Equilibrium is achieved when the forward reaction rate equals the ... equilibrium constant. E Equilibrium is achieved when reactant and product concentrations are equal.
Last Answer : E Equilibrium is achieved when reactant and product concentrations are equal.
Description : The equilibrium constant for the gas phase reactio A + B = C + D is 10-3. The rate of the forward reaction is 10-11 cubic centimeters per molecule per second. What is the rate constant of ... second y) 10-10 cubic centimeters per molecule per second z) 10-14 cubic centimeters per molecule per second
Last Answer : ANSWER: Z -- 10-14 CUBIC CENTIMETERS PER MOLECULE PER SECOND
Description : How big a power supply do I need for a gaming computer with a Core 2 Extreme Qx9770 quad-core 3.3 Mhz and dual hard drives?
Last Answer : 500 watt powersupply is what you need.
Description : Circuits which maintain constant voltage or current outputs are called dc voltage or dc current ___.
Last Answer : Regulators.
Description : While testing a semi-conductor diode with an ohmmeter, both the forward and reverse readings are almost in the infinity range. This would indicate that the unit is _____________. A. good B. open C. grounded D. shorted
Description : Which of the following statement is false (a). Enzymes are differentiated by electrophoresis method (b). While DNA sequencing both forward and reverse primers are used (c). Amplification is done through PCR (d). ABO blood grouping is mainly used for differentiating individuals
Last Answer : Ans: (b). While DNA sequencing both forward and reverse primers are used
Description : The purpose of the 'heater resistors' for the winch circuit shown in the illustration is to _______________. EL-0102 A. limit the current in the heater circuit B. dispel moisture in the ' ... panel C. keep the winch brake housing below the dew point D. maintain winch motor operating temperature
Description : One function of the movable cams in a drum-type motor controller is to _____________. A. regulate the speed of the motor B. maintain resistance contacts in clean condition C. insulate the operating handle D. limit the amount of load put on the motor
Description : If you reverse both the field and the armature connections to a DC propulsion motor, _____________. A. the direction of motor rotation will change B. the brushes will become overheated C. a magnetic lock will occur in the motor D. the direction of motor rotation will remain the same
Last Answer : Answer: D
Description : Reversing any two of the three rotor leads on a wound-rotor induction motor will _____________. A. increase motor performance B. decrease motor performance C. reverse the motor rotation D. have no effect on the direction of rotation or motor performance
Description : To reverse the direction of rotation of a three-phase AC induction motor, do one of the following: w) reverse any two of the three-phase connections x) change the frequency of the applied AC power y) operate the motor below the stall torque at very high slip z) none of the above
Last Answer : ANSWER: W -- REVERSE ANY TWO OF THE THREE-PHASE CONNECTIONS
Description : How can we reverse the direction of rotation of synchronous motor?
Last Answer : By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.
Description : how can we reverse the direction of rotation of three phase induction motor ?
Last Answer : The direction of rotation of three phase induction motor can be reversed by plugging i.e by changing any two out of three phases of the supply to the stator of the Induction motor terminal.
Description : Comparing Tape and Cartridge Drives?
Last Answer : Two types of external computer storage devices are tape andcartridge drives. Tape and cartridge drives are both goodalternatives if you are looking for a way to store large amounts ofdata. Both have their ... of tape drives is that you can choose froma wide range of storage capabilities. They can
Description : Disks Drives, CD - ROM driver, Tape Drives are: a) Primary Storage Devices b) Secondary Storage Devices c) Both of Above d) None of These
Last Answer : b) Secondary Storage Devices
Description : Consider a system with twelve magnetic tape drives and three processes P1, P2 and P3. Process P1 requires maximum ten tape drives, process P2 may need as many as four tape drives and P3 may need upto nine ... , system is in: (A) safe state (B) unsafe state (C) deadlocked state (D) starvation state
Description : What is Capstan or Tarot Led ?
Last Answer : Capstan or Tarot Led is just an improved version of Center Led. Capstan or torret lead is a type of lead that is made instead of engine stock for the purpose of rapid production.
Description : What is the difference between the first officer and the capstan?
Last Answer : What is the answer ?
Description : Theodolite is an instrument used for (a) Tightening the capstan-headed nuts of level tube (b) Measurement of horizontal angles only (c) Measurement of vertical angles only (d) Measurement of both horizontal and vertical angles*
Last Answer : (d) Measurement of both horizontal and vertical angles*
Description : What is an example of conflict in Frankenstein that drives the story forward?
Last Answer : Feel Free to Answer
Description : The purpose of the bias winding in figure 'B' shown in the illustration is for ____________. EL-0091 A. changing the direction of current in the control winding B. setting the operating point of the ... use of either AC or DC in the load circuit D. changing the direction of current through the load
Description : The concept dual nature of Matter was put forward by?
Last Answer : Louis de-Broglie
Description : A ________bridge can forward and filter frames andautomatically buildits forwarding table. A) simple B) dual C) transparent D) none of the above
Last Answer : transparent
Description : Armature reaction in a dc motor causes a shift of the neutral plane in which direction?
Last Answer : Opposite the rotation.
Description : In a dc motor that must be able to rotate in both directions, how is the direction changed?
Last Answer : By reversing either field or armature connections
Description : What factors determine the direction of rotation in a dc motor?
Last Answer : Direction of armature current, and direction of magnetic flux in field.
Description : A hysteresis motor (A) is not a self-starting motor. (B) is a constant speed motor. (C) needs dc excitation. (D) can not be run in reverse speed.
Last Answer : (B) is a constant speed motor
Description : A loss of field excitation to an AC generator while operating in parallel will cause it to ____________. A. absorb more and more load due to decreased armature reaction B. lose its load due to ... polarity D. lose its load, begin to motorize, trip out on reverse power relay, and possibly overspeed
Description : Cartridge hard disk drives with 14" disk packs may require what additional types of preventive maintenance?
Last Answer : a. Cleaning with a special cleaning disk. b. Cleaning air filters. c. Cleaning spindles, rails, and slides. d. Cleaning and buffing read/write heads.
Description : A kit for cleaning floppy disk drives contains what two items?
Last Answer : . a. A cloth or fiber cleaning disk. b. A bottle of cleaning solution.
Description : Why do floppy disk drives require more preventive maintenance than hard disk drives?
Last Answer : They are not sealed units, and they use flimsy plastic disks with an oxide coating that wears off and sticks to the heads
Description : Older, single-sided, single-density floppy disk drives would probably use what method for encoding digital data onto the floppy disk?
Last Answer : Frequency-modulation encoding.